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Alberta Mineral Assessment Reporting System
/
ECONOMIC MINERALS FILE REPORT No.
0.
CHARLES LAKE URANIUM PROJECT
(QUARTZ MINERAL EXPLORATION PERMIT NO. 61)
DYNALTA OIL & GAS CO. LTD. Calgary, Alberta
August, 1969
R.M.P. Jones, P. Geol.
z,v ae xjws DocI)7E&JT A/C, 700047
LIST OF CONTENTS
INTRODUCTION ......................................................
BACKGROUND ON PROJECT AREA........................................
Location and Access ..........................................
Geology ......................................................
Mineralization ...............................................
Radioactive Occurrences ......................................
References ...................................................
RESULTS ............................................................
Aeroradiometric Survey .........................................
Ground Reconnaissance. .......................................
CONCLUSIONSAND RECOMMENDATIONS ............ ......................
APPENDIX A - Description of Aeroradiometric Equipment and Procedures ...........................................
APPENDIXB- ListofAnomalies ....................................
APPENDIX C - Detailed Account of Ground Reconnaissance ............
.
.
Page No.
1
2
2
2
3
3
3
5
5
6
7
8
11
14
0
LIST OF ILLUSTRATIONS
Map No. 1 - Index Map ................. . .................... Opposite Page l
Map No. 2 - AeroradiometricMap.. ...... ... ... ............. Opposite Page 11
.
.
0
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INDEX MAP CHARLES LAKE PROJECT MAP NO. I
-1-
INTRODUCTION
This project was planned as an aeroradiometric survey of a north-south
trending area of igneous and highly metamorphosed Precambrian sediments
lying west of Charles Lake in northeastern Alberta. A brief ground check was
to be made to evaluate a few of the better anomalies.
The aeroradiometric program was started on June 10th and finished on June
21st, 1968. The party consisted of five men - an air crew comprising pilot,
navigator and instrument operator, and a geologist and draftsman on the
ground.
Aeroradiometric survey equipment and procedures are described in Appendix A.
A day (June 23rd) was also spent checking several of the anomalies found
in the survey by two geologists, one of whom was also supervising the aero-
radiometric program. They used a Sharpe GIS-2 portable spectrometer and
operated from a Cessna 185 aircraft, equipped with wheels and amphibian
floats, and with the Robertson STOL (short takeoff and landing) wing con-
version.
.
is
.
-2-
BACKGROUND ON PROJECT AREA
Location and Access
The project lies in the extreme corner of northeastern Alberta between
Latitude 59 °45' to 60000, North and Longitude 1100001 to 11100 West, with
Permit No. 61 in the northwestern portion of the area.
The area is readily accessible for survey flying from the Fort Smith Airport.
Access for development would probably be initially by float plane. (The
project area would be about 40 to 50 miles from the Slave River or Lake
Athabasca.) However, a road survey is aparently being made east of the
Slave River at Fort Smith probably to terminate in Fort Reliance or possibly
Uranium City. It is reported that a photo study has already been made by the
Federal Government of the route to Fort Reliance.
Geology
Sediments in the northeast corner of Alberta consist mainly of granites -
often porphyritic, granite gneisses, metamorphosed sediments (quartzites and -
schists), myloniites and minor amphibolites.
There are a number of apparently major north-south faults and several
northwest-southeast faults. The north-south faults are marked by strongly
myloniitized zones.
.
- 3-
.
Mineralization
Molybdenite is found in several occurrences to the east of the Permit (near
Andrew Lake area), possibly in association with the Bonny northwest-southeast
Fault. Arsenopyrite and minor chalcopyrite have also been found in the
general area. No mineral occurrences - other than radioactive - have been
noted within Permit No. 61.
Radioactive Occurrences
Radioactive occurrences (probably uranium) have been noted in the general
area particularly along the Bonny Fault where (apparently) McIntyre Porcupine
are doing some drilling. Within or near Permit No. 61, two radioactivity
• shows were noted in the granite west of Charles Lake, one west of Selwyn
Lake in the quartzite, and two northwest of Dawson Lake in or near the
quartzite.
References
1. Geological Survey of Canada Preliminary Map 10-1959 (Fort Fitzgerald,
4 mile, G.C. Riley, 1960).
2. Research Council of Alberta, Geological Division Bulletin No. 1 -
"Aerial Photographic Interpretation of Precambrian Structures North of
Lake Athabasca" (J.D. Godfrey, 1958).
3. Research Council of Alberta Preliminary Report 58-3 - "Geology of the
Andrew Lake, North District" (J.D. Godfrey, 1961).
4. Research Council of Alberta Preliminary Report 58-4 - "Mineralization
in the Andrew, Waugh and Johnson Lakes Area, Northeastern Alberta"
(J.D. Godfrey, 1958).
.
-4-
5. Research Council of Alberta Preliminary Report 61-2 - "Geology of the
Andrew Lake, South District, Alberta" (J.D. Godfrey, 1963).
6. Research Council of Alberta Preliminary Report 62-1 - "Geology of the
St. Agnes Lake District, Alberta" (JD. Godfrey, E.W. Peikert, 1963).
7. Research Council of Alberta Preliminary Report 62-2 - "Geology of the
Cohn Lake District, Alberta" (J.D. Godfrey, E.W. Peikert, 1964).
8. Research Council of Alberta Preliminary Report 65-6 - "Geology of the
Bayonet, Ashten, Potts and Charles Lakes District, Alberta" (J.D. Godfrey,
1966).
9. Geological Survey of Canada, Geophysics Paper No. 7161 (Fitzgerald,
4 mile, Airborne Magnetic Series).
(N.B. - This area also available on 1" = 1 mile airborne magnetometer.
sheets.)
.
-5-
RESULTS
Aeroradiometric Survey (For details on airborne anomalies, see Appendix B.)
The aeroradiometric survey covered a total of 450 surveyed flight miles or
one-quarter mile spacing.
A total of 194 individual anomalous high kicks or zones of related high kicks
were recorded (see Map No. 2 opposite Page 11). A reading on the tape was
considered anomalous if it registered 50 counts per second or more on the
uranium log above the background which, in this case, was about 25 counts
per second, i.e. anomalies were only considered that registered three times
.
background or more. This rather high criteria of 50 counts per second excess
uranium over background used in anomaly selection was found necessary as the
"noise" kick or apparent meaningless variation in background appeared to run
well above 25 counts per second above background. However, a number of
clean kicks running less than 50 counts per second above background have been
plotted on the maps and are noted in,Appendix B as it was thought they might
have some significance in extending the radiation patterns around the main
anomalies.
Geologically, the rocks in this anomalous area are mapped as mainly por-
phyritic red granites. They vary from coarse to fine grained, and are
foliated and lineated - possibly gneissic. The aeromagnetic map (Geophysics
Paper 7161 Aeromagnetic Series) shows a prominent fault zone (the Warren
.
Fault) directly west of this anomalous area. High magnetic values are also
-6-
present on the east in the Mercredi Lake area, with the trend running north-
south.
This northwestern portion of the Charles Lake project can be summed up as a
region containing numerous local areas of high radioactivity, many of which
persist up to a mile in length along the flight lines. Much of this radio-
activity is due to thorium but many areas also exhibited quite high uranium
anomalies.
Ground Reconnaissance (For details, see Appendix C.)
This ground check was severely limited by time, but during the course of a
single day, five anomalies were visited in two separate areas.
.
-7-
CONCLUSIONS AND RECOMMENDATIONS
The very numerous anomalies of both uranium and thorium in the northwestern
part of the project single it out as an area well worth a detailed investiga-
tion. While the content of radioactive material in the rocks examined in the
very brief one day ground check was not ore grade, it must be remembered that
the aeroradiometric survey is probably, in practice at least, more qualitatave
than quantitative. The very widespread nature of low grade uranium and
thorium radioactivity makes it logical that detailed spectrometer measure-
ments plus geologic mapping be conducted to find any uranium concentrations.
With this in mind, the following recommendations are made:
1. That complete flight line recovery of this area be made on photomosaics
or air photographs in this recommended area.
2. That a detailed ground examination be made of all anomalies using radio
metric equipment and mapping the geology.
3. That further exploration would naturally be based or this ground examina-
tion.
August, 1969 R.M.P.6cies, --
S
-8-
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e7l _7
GOP-VICAL CONSULTANTS & CQNTFC7C.F(
A OIVSION OF SCNTREX LMT
APPENDIX "A"
AERO-RADIOMETRIC SURVEY EQUIPMENT AND PROCEDURES
The reconnaissance aero-radiometric survey was executed
using the following equipment installed in a Beechcraft Baron twin-engined aircrait.
1'
1. Dual Scintrex SC-1 single channel, threshold-type, integral spectrometers were employed. One of these was set with its threshold at about 1. 65 MeV level, i. e. to exclude all K40 gamma radiation but to accept uranium and thorium radiation. The threshold of the second 5C-1 was set at about 2. 50 MeV level, i. e. to exclude all K40 and uranium energy but to accept the higher energy thorium radiation. By means of an analogue computer network the output of the second SC-1 was used to "strip", from the output of the first SC-i the gamma radiation component due to thorium, thus leaving only uranium radiation. In this fashion two channels of information are recorded, one refiectirg only uranium gamma radiation and the second only thorium radiation.
The sensor-detector system for the dual channel spectrometer consisted of three matched thallium-activated sodium iodide crystals 4" in thickness by 5 1 ' in diameter each coupled to a photomultiplier tube assembly.
2. Bonzer radio altimeter. This was fed into an encoder which converted the altimeter output from analogue form to a series of timed impulses. The pulse interval is proportional to the altimeter output, i. e. to the height of flight.
79 MARTIN RO&S AVCNUE DOWNSViEW. ONTARIO, CANADA CABLE: SCNTREX TELEPHONE 63301 AREA CODE (Eu)
I' Appendix ' IA" -9-
3. Moseley two-channel graphic recordcr, each c-art-1 rccording one channel of the spectrometer out?ut. The radio altimeter output pulse train was exprebed by one side-pen marker.
4. Vtnten 16 mm continuous recording positioning camera.
5. Intervalometer synchronizing the camera exposures and one side-pen marker on the Moseley trace.
The following survey specifications were employed:
a) Spectrometer time constant - 1 second.
b) Mean survey terrain clearance - 150 ft.
c) Mean survey velocity - 170 m. p. h.
d) Mean reconnaissance line spacing - 2 miles.
In order to check on the complete system conditions a
. standard sample of refined Th was placed in a standard position relative to the
detector heads approximately once per hour. In addition a "zero drift" check
was made at the same time and with the same frequency.
The flight crew consisted of a pilot, navigator, and nstrurneLt
operator. Whereas the continuous strip 16 mm camera film provides a precise
record of the aircraft survey path, the navigator, for expediency, also makes
a record of visual "fixes" on his navigation plan (National TopographicPlan on
scale 1" = 4 miles) and on the Moseley chart. These visual fixes have been
employed for the actual reconnaissance flight path recovery, as the abundance
of easily recognizable land features renders this form of recovery both adequate
and expeditious for the widely spaced reconnaissance lines. It has been plaiined
that, for the detail flying at more closely spaced intervals, the photographic
Appendix IAeI 10
flight path recovery would be employed as a matter of routine.
There is no easy quantitative relationship between the
observed counts per second output of the gamma ray spectrometer and the
grade in U or Th of the source material. Factors such as the geometry of the
sour ce, its position and distance relative to the detector, the amount and nature
of the surface cover and leaching, etc. , will all markedly affect the observed
response. Only minimum grades, assuming very broad disseminations (semi-
inuinite case) can be established. For example, with the present equipment, it
is estimated that 0.01% U will give rise to about 300 c. p. s. on Channel 1 and
0. 01% Th will give rise to about 100 c. p. s. on Channel 2.
On this basis, a doubling of the usual background count
levels could be caused by a uniform dissemination of as little as . 0001% U or
Th (1 part per million). This testifies to the high degree of sensitivity of this
detection system. Because of the various limitations mentioned above, the
actual in-situ grade will usually be considerably in excess of this figure.
40
.
-11-
APPENDIX B - LIST OF ANOMALIES
CHARLES LAKE AERORADICX4ETRIC SURVEY
Film Surveyed Roll
Line No. Mileage No. *List of Anomalies
*First figure or figures represent the fiducial number or numbers on film and tape. Second figure (bracketed) represents the amount of excess uranium radiation in counts per second (cps.) above the background of 25 cps.
51 2920-2936-(>25<50), 2955-2970-(>25<50), 2995-3009- (>25<50), 3015-3036-(>50), 3050-3069-(>25<50), 3098-(51)
51 3390-3398-(>25(50), 3410-(56),.3453-(57), 3457-(53), 3460-(50), 3474-(61), 3479-(52), 3503-(53), 3569-(61), 3579-(73), 3585-(60), 3595-(58)
51 5556-(54), 5646-5670-(>25<50), 5693-5697-(>50), 5695-(91), 5723-5738-(>25<50)
51 6041-(56), 6069-6080-(>50), 6113-6117-(>50), 6140-(51), 6216-(51), 6229-(55), 6231-(50), 6234-(50), 6237-(50)
51 8194-(51), 8247-8273-(>50), 8266-(95), 8315-(55), 8329-8334-(>50), 8368-(51), 8375-(57), 8399-(50)
52 190-195-(>50), 200-(58), 251-(57), 255-(53), 330-335-(>50) 52 2159-(56), 2179-(52), 2210-(51), 2214-(60), 2233-2240-
(>50), 2236-(77), 2282-(49), 2286-(47), 2335-(52), 2369-(69)
60 152-(35), 167-(37), 176-190-(>25 50), 223-(54), 233-(37) 281-288-(>50), 301-328-(>25<50), 352-377-(>25<50), 386-(36)
60 2158-(54), 2193-(55),2197-2203-(>50), 2344-2364-(>25<50), 2400-2410-(>25<50), 2422-(41)
60 2726-(72), 2815-(55), 2856-(51), 2880-(69), 2894-(65), 2928-2934-(>.25<50)
60 4750-(70), 4855-(55), 4914-(54), 4934-(50), 4937-(50), 5020-(39), 5032-5046-(.25<50)
60 5292-(40), 5320-(40), 5340-(45), 5418-(47), 5473- 5495-(>25<50), 5514-(41), 5524-(55), 5539-(45), 5557-(58)
61 1031-(59), 1038-1043-(>50), 1147-(60), 1157-1178-(>25<50), 1191-1199-(>25<50), 1207-.1220-(>2550) •
61 534-(60), 593-615-(>25<50), 648-(73), 710-718-(>25<50) 61 2670-(57), 2750-2755-(>25<50), 2813-(36), 2853-(37),
2883-(37), 2896-2902-(>25<50) 67 334-(47), 360-(39), 372-380-(>25<50), 384-(46), 420-
435-(>2550), 492-528-(>25.50), 539-(64), 556-(55), 580-(62), 621-(63)
59- 1W 33.5
59- 2E 33.0
59- 3w 34.0
59- 4E 33.0
59- 5W 34.0
59- 6E 32.0
59- 7W 33.0
59- 8E 32.5
59- 9W 32.0
59-bE 32.0
59-11w 32.5
59-12E 31.5
• 59-13W
32.0
59-14E
32.5
59-15W
32.5
59-16E
33.0
.
-12-
Film Surveyed Roll
Line No. Mileage No. List of Anomalies
2506-2519-(>25<50), 2548-(50), 2588-(59), 2598-(47), 2636-(59), 2654-(46), 2675-(38), 2709-(54), 2725-(40), 2795-(35), 2799-(41), 2827-(40) 3013-3023-(>25<50), 3039-3044-(>25<50), 3090-(55), 3128-3134-(>25<50), 3147-(52), 3160-(59), 3175-(60), 3189-(39), 3218-3234-(>25<50), 3251-(47), 3256-3265-(>50) 5283-(65), 5325-(57), 5328-(52), 5402-(50), 5430-(63), 5433-(51), 5461-(45), 5472-5484-(>25<50), 5496-5508- (>25<50), 5515-5540-(>.25<50), 5588-5608-(>25<50), 5621-(51) 5809-(46), 5816-(42), 5847-(51), 5851-(50), 5884-(48), 5918-(40), 5933-(49), 5964-(50), 6004-(46), 6060-(56), 6089- (55), 6140- (56) 8148-8155-(>50), 8174-8179-(>50), 8175-(76), 8188- 8197-(>50), 8204-(51), 8205-(50), 8287-(52), 8288-(53), 8340-(52), 8416-(35) 142-(35), 202-(34), 208-(36), 214-219-(>25 50), 240-246-(>25<50), 257-(40), 280-(52), 294-(63), 341-(54), 347-352-(>50), 363-(58), 432-445-(>2550) 2395-(66), 2454-(53), 2458-(56), 2504-(58), 2510-(60), 2545-2550-(>50), 2621-2628-(>25<50), 2704-2709-(>50), 2711-(53), 2715-(64) 2885-(39), 2949-2956-(>25<50), 2977-2993-(>25<50), 3026- (67), 3126-3136-(>25<50), 3141-3147-(>25<50), 3178-(51), 3202-(61), 3252-(44) 5316-(53), 5330-(59), 5353-5363-(>50), 5371-5380-(>50), 5408-(83), 5429-(54), 5475-(52), 5485-(54), 5508-(55), 5550-(56), 5580-5588-(>25<50), 5608-(47), 5619-5631- (>25<50), 5665-5670-(>2550) 347-359-(>25<50), 373-(39), 379-(45), 424-(52), 440-(60), 449-(55), 457-(65), 466-(63), 476-(53), 509-(51), 540-551-(>50), 564-(63), 594-(60), 603-614-(>50), 606-(80) 2664-(36), 2771-2778-(>50), 2803-(55), 2831-(62), 2862-2867-(>50), 2915-(51), 2945-(61), 2956-(53), 3009-(61), 3016-(55) 3238-3245-(>50), 3258-3262-(>50), 3283-3301-(>50), 3316-(59), 3336-(64), 3380-(53), 3413-(55), 3418-(51), 3448-(52) 5399-5408-(>25<50), 5442-(57), 5520-(59), 5542-5551- (50), 5545-(85), 5578-(55), 5588-5598-(>50), 5595-(85), 5613-(54), 5620-(61), 5629-(63), 5635.-(60) 173-(52), 193-(50), 228-(53), 244-(69)
59-17W
33.5 67
• 59-18E
33.5 67
59-19W
34.0 67
59-20E
33.0 67
59-21W
33.0 67
59-22E
33.0 68
S
59-23W
33.5 68
59-24E
34.0 68
59-25W
34.0 68
59-26E
33.5 69
59-27W
33.5 69
59-28E
27.0 69
59-29W
33.5 69
33.5 74
-13-
59-31W 34.0
59-32E 31.5
59-33W 33.0
59-34E 32.0
59-35W 32.0
74 2362-(62), 2404-(60), 2461-(50), 2469-(53), 2507-(56), 2568-(54), 2575-(52), 2605-(53)
74 2749-(50), 2802-(58), 2824-(66), 2851-(56), 2912-2921- (>25<50), 2956-(51), 3045-(50), 3056-(50), 3068-(55)
74 5002-5009-(>25<50), 5050-(55), 5061-(56), 5079-(59), 5100-(74), 5119-(56), 5155-(58), 5162-(56), 5184-(50), 5195-(51), 5228-(54), 5243-(73), 5290-(64), 5324-(60)
74 5488-(51), 5518-(57), 5536-(57), 5559-(58), 5575-(76), 5586-(53), 5612-(50), 5672-(115), 5683-(58), 5685-(53), 5745-(70)
74 7727-(57), 7750-(50), 7759-(55), 7786-(50), 7800-7821- (>25<50), 7850-7867-(>25<50), 7870-7892-(>25<50), 7913- (55), 7916-(59), 7940-(55), 7961-(59)
75 461-490- (>25<50) 75 1045-(40), 1086-(42) 75 75 2375-(47), 2405-(47) 75 3642-(54), 3652-(55) 75
59-36W
15.0
59-37E
19.0
59-38W
17.0
59-39E
16.0
5 9-40W
18.0
59-41E
19.0
0
.
-14-
APPENDIX C - DETAILED ACCOUNT OF GROUND RECONNAISSANCE (See Map No. 2)
On June 23rd, 1968, an area on Line No'. 59 - 34E31 with an airborne anomaly
of 115 cps., was traversed on the northeastern shore of a small lake using a
GIS-2 spectrometer. Here the rock consisted of a fine to medium grained por-
phyritic granite with readings of 10 to 11 counts per second on a threshold
setting of 5.00 (UTh). At Location No. 1 (shown on Map No. 2), higher read-
ings were obtained as follows:
Threshold Setting 5.00 (UTh) - 24 cps; Background - 4 cps.
Threshold Setting 7.65 (Th) - 7 cps; Background - 2 cps.
Using the formula:
(CPS - BGCPS ) - 2.7 (CPS - BGCPS ) 7 Uranium = TJTh 13Th Th Th
830
the rock (a finer grained red granite) calculated out at 0.0087 uranium.
The area of the airborne anomaly appeared to mark the contact between two dif-
ferent types of rock - a porphyritic granite with readings of 10 to 11 cps.
to the west, and the red granite with 20 - 25 cps. (Near the lake shore it-
self, there was also a small diorite area with counts of 4 - 5 cps.) The
high ridge close to the lake shore may have had a topographic effect on the
airborne readings. Going east, the high counts continued with Location No. 2
giving similar readings of 23 cps. on 5.00 (UTh) setting and 8 cps. on 7.65
(Th) setting. This was also a red granite with a fairly high mafic content.
A second area was also examined from another small lake about a mile and a
half north-northwest of the first area. The area lies along Line No. 59-29J.
.
-15-
The rocks were mainly pink porphyritic granite (which gave the background
readings shown below), and over a few square feet, a finer granite was found
surrounded by the more common, coarser porphyritic type. Readings on the
fine granite were as follows:
Threshold Setting 5.00 (UTh) - 20 cps; Background - 3 cps.
Threshold Setting 7.65 (Th) - 5 cps; Background - 1 cps.
The traverse was continued due east along Line No. 59-29W as far as Location
No. 4. At this point, a reading of 15 cps. on 5.00 (UTh) setting and 3 cps.
on 7.65 (Th) setting was obtained. Rock type was a dark grey ?gneiss with
porphyroblasts of pink potash-feldspar. No other significant readings were
obtained, though a number of granite ridges and outcrops lying between the
two location points were covered twice during this traverse.
0
-0 MMIN ki 777
Tr 5 559 10 -5m 13 A~ 11121
A ma 80
, I ) L) II 1tJ
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